EP0609592A1
Expired / Lapsed
EP
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Color wide dynamic range camera
Assignee: iSight Inc
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Filing: 1993-02-03
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Granted: —
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Expires: 2013-02-03
Abstract
Abstract The apparatus is a color wide dynamic range video camera which takes a plurality of images at different exposure levels, applies neighborhood processing to each of the images, and then combines the components into a final image.
Inventors
- 👤 Ran Ginosar
- 👤 Ofra Zinaty
- 👤 Noam Sorek
- 👤 Tamar Genossar
- 👤 Yehoshua Y. Zeevi
- 👤 Daniel J. Kligler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:37
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/70
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
90 words
A color wide dynamic range video imaging apparatus comprising: sensor means for providing a plurality of color video images of a scene at different exposure levels; means for dividing each color video image into components; and means for processing said components of each of said plurality of color video images to produce a combined color video image including image information from said components of each of said plurality of color video images by processing to at least one of said components of each of said plurality of color video images.
Claim 2
Dependent Claim
87 words
The color wide dynamic range video image apparatus of Claim 1 wherein said means for processing includes a first means for transforming each of said plurality of color video images into an achromatic component and two chromatic components; neighborhood processing means for each of said achromatic and chromatic components thereby generating a processed achromatic component and two processed chromatic components; and a second means for transforming said processed achromatic and chromatic components into at least three chromatic output components of each of said plurality of video images.
Claim 3
Dependent Claim
47 words
The color wide dynamic range video image apparatus of Claim 2 wherein said first means for transforming uses a first matrix multiplier; wherein said second means for transforming uses a second matrix multiplier; and wherein said second matrix multiplier is an inverse of said first matrix multiplier.
Claim 4
Dependent Claim
54 words
The color wide dynamic range video image apparatus of Claim 3 wherein said first matrix multiplier includes: a first row with elements substantially equal to 0.2684, 0.6749 and 0.0567; a second row with elements substantially equal to 0.6762, -0.5766, and -0.0997; and a third row with elements substantially equal to 0.1604; 0.2434; and -0.4038.
Claim 5
Dependent Claim
38 words
The color wide dynamic range video apparatus of Claim 2 including one of said means for processing for each of said plurality of video images; and adder means for combining output of each of said means for processing.
Claim 6
Dependent Claim
20 words
The color wide dynamic range video apparatus of Claim 5 further including histogram means for enhancing output of said apparatus.
Claim 7
Dependent Claim
97 words
The color wide dynamic range video image apparatus of Claim 1 wherein said means for processing includes a first means for transforming each of said plurality of color video images into an achromatic component and two chromatic components; neighborhood processing means for said achromatic component thereby generating a processed achromatic component; gain multiplying means for applying a gain to said chromatic components thereby generating amplified chromatic components; and a second means for transforming said processed achromatic component and said amplified chromatic components into at least three chromatic output components of each of said plurality of video images.
Claim 8
Dependent Claim
18 words
The color wide dynamic range video apparatus of Claim 7 wherein said gain multiplying means comprises look-up tables.
Claim 9
Dependent Claim
40 words
The color wide dynamic range video apparatus of Claim 7 including one of said means for processing for each of said plurality of video images; and further including adder means for combining output of each of said means for processing.
Claim 10
Dependent Claim
20 words
The color wide dynamic range video apparatus of Claim 9 further including histogram means for enhancing output of said apparatus.
Claim 11
Dependent Claim
25 words
The color wide dynamic range video imaging apparatus of Claim 1 wherein said components of each of said plurality of color video images are chromatic.
Claim 12
Dependent Claim
86 words
The color wide dynamic range video camera of Claim 11 wherein said means for processing includes a means for receiving each of said chromatic components and generating an intensity signal therefrom; means for processing said intensity signal; means for combining said processed intensity signal into said chromatic components; memory means for storing previous information for each of said chromatic components; means for combining said previous information for each of said chromatic components into said chromatic components and output look-up table means for transforming said chromatic components.
Claim 13
Dependent Claim
22 words
The color wide dynamic range video camera of Claim 12 further including second processing means receiving an output of said memory means.
Claim 14
Dependent Claim
38 words
The color wide dynamic range video camera of Claim 12 wherein said means for processing further includes an exposure-dependent look-up table between said means for combining said processed intensity signal into said chromatic components and said memory means.
Claim 15
Dependent Claim
35 words
The color wide dynamic range video camera of Claim 14 wherein said means for processing further includes a non-linear look-up table applied to said intensity signal from an image taken at a higher exposure level.
Claim 16
Dependent Claim
21 words
The color wide dynamic range video camera of Claim 15 wherein exposures are taken of different fields and are thereafter combined.
Claim 17
Dependent Claim
24 words
The color wide dynamic range video camera of Claim 16 wherein said output look-up table means includes gamma correction means and histogram correction means.
Claim 18
Dependent Claim
71 words
The color wide dynamic range video camera of Claim 11 wherein said means for processing includes for each of said plurality of color video images: means for calculating a luminance component from said three chromatic components; means for calculating a convolved luminance component from said luminance component; means for calculating a weighting factor from at least said luminance component; and means for multiplying said weighting factor times said three chromatic components.
Claim 19
Dependent Claim
24 words
The color wide dynamic range video camera of Claim 18 wherein said means for calculating divides said convolved luminance component by said luminance component.
Claim 20
Dependent Claim
94 words
The color wide dynamic range video camera of Claim 11 wherein said means for processing includes for each of said plurality of color video images: means for calculating a luminance component from said chromatic components; means for dividing said chromatic components by said luminance component to produce normalized chromatic signals; means for calculating a processed luminance component from said luminance component; means for calculating a weighting factor from at least said luminance component of each of said plurality of color video images; and means for multiplying said weighting factor times said normalized chromatic components.
Claim 21
Dependent Claim
40 words
The color wide dynamic range video camera of Claim 20 further including a means for adding said processed luminance components from each of said plurality of color video images and multiplying an output therefrom times said combined color video image.
Claim 22
Dependent Claim
20 words
The color wide dynamic range video camera of Claim 1 wherein said sensor means comprises a two dimensional sensor array.
Claim 23
Dependent Claim
19 words
The color wide dynamic range video commerce of Claim 1 wherein said sensor means comprises a linear sensor array.
References Cited (Backward Citations)
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